How to keep original size after hardcoding subtitles?

So i have hardcoded some tv shows and watched on my tv just fine didn't care for the file size cause it is small, but i want to hardcode some 1080p movies and keep original file size if possible cause they are like 3 gigs and my flash drive doesn't have
much space ( i know i could buy one with large size but i don't want right now ). Can i keep original size after hardcoding using proper settings?